Generator Stator Earth Fault Relay .
[LEFT][SIZE=4][B] [URL="http://science-hamza.blogspot.com/2010/12/generator-stator-earth-fault-relay-64g.html"]Generator Stator Earth Fault Relay (64G) - 27TN.[/URL] [/B]
[/SIZE][/LEFT] [CENTER][URL="http://2.bp.blogspot.com/_CZnqYQLLQtc/TRIyhZc8JOI/AAAAAAAAADs/LyhlDxE_Zeg/s1600/gen_1.JPG"][IMG]http://2.bp.blogspot.com/_CZnqYQLLQtc/TRIyhZc8JOI/AAAAAAAAADs/LyhlDxE_Zeg/s400/gen_1.JPG[/IMG][/URL][/CENTER] [LEFT][SIZE=4][U][F**T=Impact]Generator Stator Earth Fault Relay (64G) - 27TN.[/F**T][/U] [/SIZE][/LEFT] [U][F**T=Impact] [/F**T][/U][LEFT][SIZE=3][U][F**T=Impact] [/F**T][/U] [B][I]-For high impedance grounded generators, a voltage relay across the sec**dary winding of the generator neutral grounding transformer is used to detect the ground fault ** the generator stator winding.[/I][/B] [B][I]-The neutral over voltage functi** (59N) resp**ds to the fundamental frequency voltage at the generator neutral that appears when a ground fault occurs.[/I][/B][/SIZE] [SIZE=3] [B][I]-Normally, it will protect up to 90≈ 95 % of the stator windings.[/I][/B][/SIZE] [SIZE=3] [B][I]-The neutral under voltage functi**s resp**ds to 3rd harm**ic voltage measured at the generator neutral. When used in c**juncti** with the neutral over voltage functi**, it provides 100% ground fault protecti** of the stator winding.[/I][/B][/SIZE] [SIZE=3] [B][I][F**T="]-In healthy state, the machine 3rd harm**ic voltage is distributed over the windings such that the maximum occur at the star point neutral and at the line terminal. For a ground fault close to the neutral, all the 3rd harm**ic voltage is transferred to the line terminals. C**sequently, the relay functi** will see a 3rd harm**ic under voltage at the neutral end and will operate the protecti** element.[/F**T][/I][/B][/SIZE] [SIZE=3] [/SIZE][/LEFT] [CENTER][URL="http://3.bp.blogspot.com/_CZnqYQLLQtc/TRIyv2V3fJI/AAAAAAAAADw/kbQtIxb0p74/s1600/stator_earth.JPG"][IMG]http://3.bp.blogspot.com/_CZnqYQLLQtc/TRIyv2V3fJI/AAAAAAAAADw/kbQtIxb0p74/s400/stator_earth.JPG[/IMG][/URL][/CENTER] |
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